Len, it is not a problem with DNS as far as I can tell, it is how the Imail
registry has the value and Imail is using that value.
As you know, the remote MTAs only see Imail's public IP in the
TCP/SMTP session coming from the outside of the NAT box.
The only way a remote MTA could discover the internal IP of Imail is
through DNS query for the whatever Imail announces as domain name in
the HELO command as SMTP client or in the SMTP greeting as SMTP server.
dig +sh mail.eservicesforyou.net a
192.168.41.39
... definitely not recommended.
Well, another way to discover internal IPs would be looking for IPs
in the Received: headers of the DATA command, but little weight
should be given to forgeable Received: headers.
Len
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